Changed

• Realtime Database references are now validated by the API instead of locally. Validation rules can change at any time, and the SDK can only adapt to changes in the API. While local checks could prevent obviously invalid paths, they'd also require an SDK update whenever Firebase loosens a rule. Developers can be trusted not to use invalid paths 😅.
• Removed the #[SensitiveParameter] attribute again, because it's supported by PHP 8.1 itself, but not in combination with Valinor. (#1034)